Impact crusher



Sept. 29, 1964 c. A. ADAMS IMPACT CRUSHER Original Filed April 4, 1958 INVENTOR. Chm as" 3.0aarrza fl/ M, 7/

fillllk United States Patent 3,150,838 IMPACT CRUSHER Charles A. Adams, Wurtsboro, N.Y., assignor to Adams Engineering Company, a corporation of Illinois Original application Apr. 4, 1958, Ser. No. 726,565, now

Patent No. 3,058,679, dated Get. 16, 1962. Divided and this application Oct. 8, 1962, Ser. No. 228,974

2 Claims. (Cl. 241-275) The present invention relates to an impact crusher and more particularly to certain improvements and various features of an impact crusher, all making for greater ease of assembly and changing of worn or damaged parts and for generally increasing the efliciency of such a crusher. This application is a division of my co-pending application S.N. 726,565, filed April 4, 1958, now Patent No. 3,058,679.

It is a general object of the invention to provide an improved impact crusher with many features of novelty and improvement.

It is also an object to provide an improved means for detachably holding in place the breaker plates of an impact crusher, thereby facilitating the changing of breaker plates when desired.

Other objects and various further features of invention will be hereinafter pointed out or will become apparent to those skilled in the art.

In the drawings which show, for illustrative purposes only one embodiment of the invention:

FIG. 1 is a partial vertical sectional view showing a vertical-axis impact crusher embodying my invention;

FIG. 2 is a fragmentary horizontal sectional view of the casing and one form of breaker plate detachably secured therein taken along line 2-2 in FIG. 1; and

FIG. 3 is a sectional view, taken substantially in the plane of the line 33 of FIG. 2.

In said drawings, the crusher consists of a generally vertical cylindrical case 5 supported on a suitable foundation, such as the beam foundation 6, which foundation also carries a driving motor 7 and its drive pulley 8. The casing 5 has a substantially vertical bearing support 9 therein which carries a vertical shaft 11 having a pulley 11 driven by a belt 8' from the pulley 8, as will be understood. The shaft is supported on spaced bearings 9 in the casing, substantially as shown.

In the form shown, the crusher is of a two-stage type, and in the particular illustrated form, there is a substantial hub 12 carried by the upper end of the shaft 10, and this hub at the upper side carries an upper or first-stage impeller plate or disc 13 secured as by means of screws 14. The impeller plate 13 carries impeller shoe means 15 of suitable type, as will be understood, for engaging and centrifugally throwing out crushable material, entering through the inlet 16. The crushable material thrown out by the shoe means 15 will strike against breaker plates 17 secured inside the casing in position to receive the crushable material thrown out by the impeller, the generally annular space or zone between the impeller 13 and the working surfaces of breaker plates 17 may be referred to as the first crushing stage or zone.

In the form illustrated, as stated, a two-stage crusher has been illustrated, and the second stage consists of an impeller 18 carried by the hub 12 at the lower side and held as by means of screws 18. The lower or secondstage impeller 18 is larger than the first-stage impeller 13 and is so positioned that the annular path swept by blades or shoes 19 of the impeller 18 is directly beneath the first crushing zone, so as to receive crushed material dropping from or thrown from the upper breaker plates 17. The second-stage impeller shoes 19 direct partially crushed material against further breaker plates 20 for further reduction on impact. The construction is very simple and 3,150,838 Patented Sept. 29, 1964 makes for easy conversion of the machine from a onestage to a two-stage crusher or from a two-stage crusher to a single-stage crusher.

In FIGS. 2 and 3, a portion of the breaker plates 17 and the improved means for detachably mounting the same are shown in greater detail. In this embodiment, brackets 40 are spaced around and welded or otherwise secured to the shell or casing 5 for supporting the breaker plates 17 around the periphery of the impeller. Each of the brackets 40 comprises a generally flat bar 42 extending at an angle from a junction with the inner wall of the casing 5 and presenting a vertical inwardly facing abutment surface. Each bracket also includes a plate member or bar 41 secured to and extending substantially perpendicularly from the inner end of the bar 42 and welded or otherwise fixed to the inner wall of the casing.

Each breaker plate 17 includes a body portion 43 having a fiat back surface 45 adapted to fit against the flat abutment surface of the bracket bar 42. A front face 47 of the body 43 is preferably curved or otherwise shaped for promoting more effective breaking action. One or more hooks 44 are formed integrally with the body portion 43 and are adapted to engage over the upper edge of the bracket bar 42 so that when the breaker plate is lowered into the casing, each hook 44 will fit the top of the bar 42 and securely hold the breaker plate in place as shown best in FIG. 3. As is also shown clearly in FIG. 3, each hook portion 44 is formed with a surface 48 facing and inclined away from the body portion 43, which surface is adapted to engage the edge of the bracket bar 42 for drawing the body 43 firmly against the bracket. It will be apparent that removal of the breaker plate from the casing may be easily accomplished merely by lifting the breaker plate sufficiently to disengage the hooks 44 from the bracket.

It will be seen that I have provided an improved form of impact crusher having many features facilitating the assembly, replacement and repair of the crusher, and many parts are formed so as to inhibit excessive wear. The replaceable features of the breaker plates have been illustratively described in connection with the first crushing zone, but they will be seen to be equally applicable to corresponding parts of the second crushing zone, it being noted that with the upper breaker plates 17 removed, easy access is bad to the lower breaking plates 20 without removing the upper impeller disc 13.

While the invention has been described in considerable detail, it is to be understood that various changes and modifications may be made within the scope of the invention, as defined in the appended claims.

The invention is claimed as follows:

1. In an impact crusher of the type described having an upstanding casing, a bracket mounted within said casing and comprising a bar presenting a substantially fiat upstanding face and upwardly facing edge having a predetermined width, and a breaker plate including a body portion having a substantially fiat side abutting said face and having an opposite curved side against which material to be crushed is to be projected, said breaker plate including a plurality of hook elements integral with and spaced along an upper margin of said body portion and engaging over said upwardly facing edge and connecting said breaker plate with respect to said bracket, said hook elements including downwardly extending surfaces substantially facing and inclined away from said fiat side of the body portion for engaging said upwardly facing edge of the bar and drawing said flat side against said flat face of the bar, upper ends of said inclined surfaces of the hook elements being spaced laterally from said flat side o t the body portion not in excess of said predetermined width for insuring firm engagement of said flat side of the body portion against said flat face of the bar.

2. A breaker plate adapted to be detachably mounted on a bracket presenting an upwardly facing edge in an impact crusher of the type described comprising a body portion having a substantially fiat side surface substantially 'traversing said body portion and adapted to fit against a complementary flat surface of said bracket, and a plurality of hook elements spaced along and projecting from an upper marginal portion of said body portion and extendlng laterally from said side surface and then downwardly and engageable over said upwardly facing edge of said bracket for detachably securing the breaker plate to said bracket, said hook elements including downwardly extending surfaces substantially facing and inclined away from said side surface of the body portion for engaging the upwardly facing edge of the bracket and drawing said side surface of the body portion against the bracket.

References Cited in the file of this patent UNITED STATES PATENTS 1,946,763 Sallwasser Feb. 13, 1934 10 2,844,331 Adams July 22, 1958 3,044,720 Bridgewater July 17, 1962 

1. IN AN IMPACT CRUSHER OF THE TYPE DESCRIBED HAVING AN UPSTANDING CASING, A BRACKET MOUNTED WITHIN SAID CASING AND COMPRISING A BAR PRESENTING A SUBSTANTIALLY FLAT UPSTANDING FACE AND UPWARDLY FACING EDGE HAVING A PREDETERMINED WIDTH, AND A BREAKER PLATE INCLUDING A BODY PORTION HAVING A SUBSTANTIALLY FLAT SIDE ABUTTING SAID FACE AND HAVING AN OPPOSITE CURVED SIDE AGAINST WHICH MATERIAL TO BE CRUSHED IS TO BE PROJECTED, SAID BREAKER PLATE INCLUDING A PLURALITY OF HOOK ELEMENTS INTEGRAL WITH AND SPACED ALONG AN UPPER MARGIN OF SAID BODY PORTION AND ENGAGING OVER SAID UPWARDLY FACING EDGE AND CONNECTING SAID BREAKER PLATE WITH RESPECT TO SAID BRACKET, SAID HOOK ELEMENTS INCLUDING DOWNWARDLY EXTENDING SURFACES SUBSTANTIALLY FACING AND INCLINED AWAY FROM SAID FLAT SIDE OF THE BODY PORTION FOR ENGAGING SAID UPWARDLY FACING EDGE 